Support

Squirrel Loggers

Frequently Asked Questions

2010 FAQs

Battery Power

How long will the batteries last in the SQ2010 Logger?

With all channels logging, the following table can be used as a guide:-

Logging Interval
SQ2010
1 Second 3.5 days
15 Seconds 31 days
1 Minute 75 days
5 Minutes 82 days
15 Minutes 145 days

These results were conducted with a new set of Duracell Procell manganese alkaline batteries at 25 C, temperatures below about 10 C or other batteries could change values drastically. These results assume that the 5V external power supply is not being used.

What happens when the batteries are exhausted?

It is not possible to arm the logger when below approximately 5.5 volts. If the unit was logging when the voltage dropped below this point, it will disarm automatically.

Can I power from external supply?

Yes, between 8-28Vdc only. Includes 12Vdc battery.

What happens if the external supply fails?

If the external power fails, batteries must be fitted to prevent loss of data. In the case of a power failure, the logger will switch to the battery supply and continue with no interruption.

How is the battery level displayed?

By the use of a "bar" multi-segment battery indicator on the logger display and, if required, the actual voltage is displayed in the appropriate screen both on the logger display and in SquirrelView.

Can the 2010 Logger be used on a vehicle?

The logger is designed to be powered from a 12V vehicle system directly, higher system voltages will require the use of a suitable convertor.

Can the Logger be powered by the USB port?

Yes

How do I power the GSM modem?

External supply voltage (if connected) is provided at the I/O socket. This is made available for powering external devices. The voltage is permanent and cannot be switched ON or OFF.

Can I power sensors from the logger?

Yes Via connection terminal EA external supply (as supplied into the DC power socket Max 100mA B 5V regulated output Max 50mA

Can the internal batteries be rechargeable?

No only C cell alkaline batteries should be used

Connections and Communications

Is the Logger USB 2.0 Compliant?

Yes

Can I connect to the logger remotely?

Yes via 3rd party Ethernet or wireless adapters as well as GSM and dial-up modems.

Contact Grant Instruments or your distributor for more details.

Is the logger real 'plug & play' via USB?

Windows will automatically detect the presence of your data logger, supplied drivers will be required the first time used.

What if I connect to both ports simultaneously?

The USB and serial ports may be physically connected at the same time, however, the logger will talk to only one external host at a time.

Can the logger survive mains supply accidentally connected to the inputs?

The unit is not designed to withstand such an event, however the unit is ESD protected.

Can the logger connect to the Ethernet?

Yes we supply a serial RS232, Ethernet converter kit (SQ20A801) a power adaptor lead is included with the kit to power the modem and the Squirrel from the mains power pack (MPU-12V)

Operation

Can I download while the logger is logging?

Yes if downloaded via SquirrelView. The logger will download until the point that the instruction to download was issued.

Can I download by time?

Yes, use the advanced function in the download screen.

What is the alarm output regime (one per channel)?

User specified triggers can activate a total of 2 alarm outputs. As an example; these triggers may be based upon channel conditions.

What can I trigger from?

Triggers can be from analogue, digital channels or time.

Can I print direct from the logger?

No, this can only be achieved via the host.

Why is the Ref Junction set automatically when I select a Thermocouple in Sensor Type?

Thermocouples do not measure absolute temperature, they only measure the temperature difference between the sensing end (the probe tip) and the reference end (where the probe plugs into the logger). To acquire the absolute temperature the logger adds together the temperature difference measured by the thermocouple to the temperature of the reference junction. The reference junction temperature is measured by the Reference Junction channel. To save the user from having to remember to turn on the Reference Junction channel, SquirrelView and the logger do it automatically whenever a thermocouple channel is selected.

Can the logger be used outside?

The logger is not weatherproof if to be used outside or in damp conditions it will need to be placed in an IP rated enclosure

General

Can I read my data using notepad (.csv file)?

By using SquirrelView you are able to export data to .csv format to a preferred spreadsheet.

Can I fit the SQ2010 to a wall?

Yes, contact Grant Instruments or your distributor for details.

How often does the logger require calibration?

Drift is not expected although annual calibration is recommended. In real terms this is dependant upon use. Contact Grant Instruments or your distributor for further details. The last date of cal;ibration can be viewed via SquirrelView->Diagnostics->2010 Squirrel.

What is the Inter-channel isolation?

The analogue inputs are isolated from the logger's supply but must all be within ±25V of each other and within ±25V of the logger's negative power supply; the digital inputs are directly connected to the logger's negative supply andd must be in the range 0V to +5V for correct operation. The protection on the analogue inputs will turn on outside the±25V range and will try to limit them to about ±50V. The input protection will be destroyed if it is connected to a low impedance source (e.g. 230V mains supply) but it will protect against high impedance sources such as an electro-static discharge from a person. The protection on the digital inputs will turn on at about -0.5V and +6V and will protect the inputs up to about ±25V although operation outside the 0-5V range may cause counting errors. Again, the digital inputs (and outputs) are protected against electro-static discharge from a person.

Memory

How long will the memory last?

How long the memory will last is mainly dependant upon the number of channels set and their sample rate. For sample rates that are sub-hertz, 16 bytes are used per reading (less than 16 bytes is used when logging sub-hertz). If channel 1 was logging every second it would take approximately 11 days to fill the interval capacity or 16 weeks if logging every 10 seconds. If 4 channels log every 10 seconds the memory would fill in approximately 40 days.

What happens when the memory is full?

The logger will disarm and go into the memory full condition. The logger cannot be armed again until enough free space is made available by the deletion of data. Download and most other functions will still be available when the memory is full.

Can I choose how much memory to download?

It is not possible to specify memory but it is possible to download between two specified times.

Speed

How fast can I log with n number of channels?

See Sample Rates under 2010 Squirrel.

Can I have different channels logging at different speeds?

Yes, a total of 4 sample intervals can be specified, but they must be multiples of each other.

Front Panel Controls

How many Channels can I view on the logger display at the same time?

In the meter mode 3 channels are displayed on the screen at one time and others can be viewed by using the up and down arrows.

How many channels can I view on the graph display at the same time?

Only one channel can be viewed on the graph, and this is chosen from the meter mode.

Can I display sampled inputs in real time?

The metering feature allows data to be viewed on the logger display or SquirrelView at approximately 1Hz, regardless of channel sample rates.

Can you lock and disable the keypad?

You can configure the logger such that no changes to setup can be made (read only). Refer to the Configuration Tab in SquirrelView Logger Setup.

Can I program the logger from the front panel?

Yes you are able to configure channels using the front panel buttons as well as being able to load pre-configured setups that have previously been stored in the logger.

Can I start logging from the front panel keypad?

Yes the logger can be armed and disarmed from the front keypad.

2020 and 2040 FAQs

Battery and Power

How long will the batteries last in the 2020/240 Logger?

With all channels logging, the following table can be used as a guide:-

LOGGING INTERVAL
1F8
2F8/2F16
4F16
CONTINUOUS 1.75 days 1.25 days 0.75 days
5 seconds 2.5 days 2 days 1.25 days
10 seconds 5 days 3.75 days 2.5 days
15 seconds 8 days 6 days 4 days
30 seconds 16 days 12 days 8 days
1 minute 25 days 19 days 12 days
5 minutes 75 days 58 days 37 days
15 minutes 120 days 92 days 62 days

What happens when the batteries are exhausted?

It is not possible to arm the logger when below approximately 5.5. Volts. If the unit was logging when the voltage dropped below this point, it will disarm automatically.

Can I power from an external supply?

Yes, 10-18V DC only. Includes 12V DC battery.What happens if the external supply fails? If the external power fails, batteries must be fitted to prevent loss of data. In the case of a power failure, the logger will switch to the battery supply and continue with no interruption.

How is the battery level displayed?

By use of a "bar" multi-segment battery indicator on the logger display and, if required, the actual voltage is displayed in the appropriate screen both on the logger display and in SquirrelView.

Can the 20xx Logger be used on a vehicle?

The logger is designed to be powered from a 12V vehicle system directly, higher system voltages will require the use of a suitable convertor. Two high voltage inputs are available to directly monitor vehicle supplies (up to 60V).

Can the Logger be powered by the USB port?

No. However, the use of USB does not put any extra load on the logger power supply or batteries.

How do I power a GSM modem?

A power adaptor lead is included with the GSM kit (SQ20A802) to power the modem and the Squirrel from the mains power pack (MPU-12V)

Can I power sensors from the Logger?

Yes Via connection terminal EA external supply (as supplied into the DC power socket Max 100mA B 5V regulated output Max 50mA

Can the internal batteries be rechargeable?

No only AA alkaline batteries should be used

Connections and Communications

Is the Logger USB 2.0 Compliant?

Yes

Can I connect to the logger remotely?

Yes via 3rd party Ethernet or wireless adapters as well GSM and dial-up modem.

Contact Grant Instruments or your distributor for more details.

Is the logger real 'plug & play' via USB?

Windows will automatically detect the presence of your data logger, supplied drivers will be required the first time used.

What if I connect to both ports simultaneously?

The USB and serial ports may be physically connected at the same time; however, the logger will talk to only one external host at a time.

Can the logger survive mains supply accidentally connected to inputs?

The unit is not designed to withstand such an event; however the unit is ESD protected.

Can the Logger connect to Ethernet?

Yes the SQ2020 2F8, SQ2040 2F16 and the SQ2040 4F16 have inbuilt Ethernet connection. For the SQ2020 1F8 we supply a serial RS232, Ethernet converter kit (SQ20A801) a power adaptor lead is included with the kit to power the modem and the Squirrel from the mains power pack (MPU-12V)

Operation

Can I download while the logger is logging?

Yes if downloaded via SquirrelView, but not to MMC. The logger will download until the point that the instruction to download was issued.

Can I download by time?

Yes, use the advanced function in the download screen.

What is the alarm output regime (one per channel)?

User specified triggers can activate a total of 4 alarm outputs. As an example; these triggers may be based upon channel conditions.

What can I trigger from?

Triggers can be from analogue, digital channels or time.

Can I print direct from the logger?

No, this can only be achieved via the host

Can I set an automatic download?

Yes Downloader is supplied on the SquirrelView CD

Why is the Ref Junction set automatically when I select a Thermocouple in Sensor Type?

Thermocouples do not measure absolute temperature, they only measure the temperature difference between the sensing end (the probe tip) and the reference end (where the probe plugs into the logger). To acquire the absolute temperature the logger adds together the temperature difference measured by the thermocouple to the temperature at the reference junction. The reference junction temperature is measured by the Reference Junction channel. To save the user from having to remember to turn on the Reference Junction channel, SquirrelView and the logger do it automatically whenever a thermocouple channel is selected.

Can I use the logger outside?

The logger is not weatherproof if to be used outside or in damp conditions it will need to be placed in an IP rated enclosure

General

Can I read my data using notepad (.csv file)?

By using SquirrelView you are able to export data to .csv format to a preferred spread sheet.

Can I fit the logger to a wall?

Yes, a universal bracket is supplied as standard with each Logger. It can be adjusted to act as a wall bracket or desk stand.

How often does the Logger require calibration?

Drift is not expected although annual calibration is recommended. In real terms this is dependant upon use. Contact Grant Instruments for further details. The last date of calibration can be viewed via SquirrelView->Diagnostics->20xx logger

What is the Inter-channel isolation?

For 1F8 loggers, inputs on blocks A to D share a common measurement circuit and must be within ±25V of each other and within ±60V of the negative pin on the logger's power supply.

For 2F8 loggers, inputs on blocks A and B share one measurement circuit and blocks C and D share another measurement circuit. Inputs on blocks A and B must be within ±25V of each other and within ±60V of the negative pin on the logger's power supply. Inputs on blocks C and D must be within ±25V of each other and within ±60V of the negative pin on the logger's power supply. Inputs on blocks A and B must be within ±60V of the inputs on blocks C and D.

For 2F16 loggers, inputs on blocks A to D share one measurement circuit and blocks G to K share another measurement circuit. Inputs on blocks A to D must be within ±25V of each other and within ±60V of the negative pin on the logger's power supply. Inputs on blocks G to K must be within ±25V of each other and within ±60V of the negative pin on the logger's power supply. Inputs on blocks A to D must be within ±60V of the inputs on blocks G to K.

For 4F16 loggers, there are four separate measurement circuits connected to four pairs of input blocks - A and B, C and D, G and H, and J and K. Inputs on each pair of blocks must be within ±25V of each other and within ±60V of the negative pin on the logger's power supply. Any input on any block pair must also be within ±60V of any other input on any other block pair.

Caution: Voltages approaching 60V and above can cause personal injury.

Memory

How long will the memory last?

How long the memory will last is mainly dependant upon the number of channels set and their sample rate. For sample rates that are not sub-hertz, 16 bytes are used per reading (less than 16 bytes is used when logging sub-hertz). If Channel 1 was logging every second it would take approximately 11 days to fill the internal capacity or 16 weeks if logging every 10 seconds. If 4 channels log every 10 seconds the memory would fill in approximately 40 days.

The table below can be taken as a guide for a logger set to the default memory size of 16Mb

Logging Interval 1 Channel 4 Channels 8 Channels 16 Channels 32 Channels
100 Samples Per Second * 5 Hours 1 Hour
20 Samples Per Second * 26 Hours 7 Hours
10 Samples Per Second * 50 Hours 13 Hours 7 Hours
5 Samples Per Second * 92 Hours 26 Hours 13 Hours 7 Hours
2 Samples Per Second * 184 Hours 61 Hours 32 Hours 17 Hours 8 Hours
1 Second 276 Hours 110 Hours 61 Hours 32 Hours 17 Hours
15 Seconds 4133 Hours 1653 Hours 919 Hours 486 Hours 251 Hours
30 Seconds 8267 Hours 3307 Hours 1837 Hours 973 Hours 501 Hours
1 Minute 16533 Hours 6613 Hours 3674 Hours 1945 Hours 1002 Hours
* Refer to the logger sample rates for the number of channels possible at the faster sampling rates

If I install a external memory card, will it increase the memory?

No, the memory card is used to download your data without the need for a PC.

What happens when the memory is full?

The logger will disarm and go into the memory full condition. The logger cannot be armed again until enough free space is made available by the deletion of data. Download and most other functions will still be available when memory is full.

Can I choose how much memory to download?

It is not possible to specify memory but it is possible to download between two specified times.

Do I need to use a specific brand of memory card?

If you experiencing compatibility problems with a MMC/SD card, ensure that the logger controller firmware is at version 2.2 or above (firmware upgrades are included in you SquirrelView installation directory).

Do you recommend a specific brand of memory card reader?

Any brand name should work without issue but SANDISK or Microtech Zio are two known good readers.

Can I program the logger from a memory card?

Yes, in that setups created in SquirrelView can be saved onto a card and loaded into the logger using the stored setups menu.

Speed

How fast can I log with n number of channels?

See Sample Rates under 2020/40 Squirrel

Can I have different channels logging at different speeds?

Yes, a total of 4 sample intervals can be specified, but they must be multiples of each other.

Front Panel Controls for new SQ2020/2040 range with128*64 dot graphical LCD

How many Channels can I view on the logger display at the same time?

In the meter mode 3 channels are displayed on the screen at one time and others can be viewed by using the up and down arrows.

How many channels can I view on the graph display at the same time?

Only one channel can be viewed on the graph, and this is chosen from the meter mode.

Can I display sampled inputs in real time?

The metering feature allows data to be viewed on the logger display or SquirrelView at approximately 1Hz, regardless of channel sample rates.

Can you lock and disable the keypad?

You can configure the logger such that no changes to setup can be made (read only). Refer to the Configuration Tab in SquirrelView Logger Setup.

Can I program the logger from the front panel?

Yes you are able to configure channels using the front panel buttons as well as being able to load pre-configured setups that have previously been stored in the logger.

Can I start logging from the front panel key pad?

Yes the logger can be armed and disarmed from the front keypad.

Front Panel Controls for the old range of SQ2020 and SQ2040 ranges (models released before March 2011)

How many channels can I view on the loggers display at the same time?

One channel at a time by using the metering feature, with auto scroll of all channels if required (press and hold enter key).

Can I display sampled inputs in real time?

The metering feature allows data to be viewed on the logger display or SquirrelView at approximately 1Hz, regardless of channel sample rates.

Can you lock and disable the keypad?

You can configure the logger such that no changes to setup can be made (read only). Refer to the Configuration Tab in SquirrelView Logger Setup.

Can I program the Logger from front panel?

You may load pre-configured set-ups that have previously been stored in the logger, or from the External Memory Card

Can I start logging from the front panel key pad?

Yes the logger can be armed and disarmed from the front panel key pad.