Physitemp Instruments BAT-10 - Manual (Page 9)

4.2 Select the required range by depressing the 1° or 0.1° RANGE SELECT pushbutton.
Be sure that the DIFF pushbutton is not depressed.
4.3 Direct measurements are made with inputs 1 and 2. If two probes are being used, just
depress the PROBE SELECT pushbutton which corresponds with the sensor to be monitored.
5.0 DIFFERENTIAL MEASUREMENT TECHNIQUES
5.1 Specifications of the differential range are as follows:
Resolution 0.01°C
Accuracy 0.01°C (±1 digit)
Repeatability 0.01°C
Linearity is centered at 40°C
Range -19.99 to +19.99°
5.2 USING THE DIFFERENTIAL RANGE:
Before making measurements, check and adjust the DIFF ZERO as follows:
Remove probes from all sockets.
Select DIFF range pushbutton.
Select DIFF ZERO.
Wait for about 30 seconds for reading to stabilize.
Adjust ZERO with screwdriver until it displays 0.00
Release DIFF ZERO
Connect probes to INPUTS 2 and 3 only.
Read temperature difference between probes:
If probe in input 2 is at the higher temperature, the temperature
reading will be positive.
If probe in input 2 is at the lower temperature, the temperature
reading will be negative.
5.3 When making differential measurements with 0.01° resolution:
• Keep instrument away from drafts or sources of heat.
• When instrument is moved from one location to another, allow at least one hour
for temperature stabilization before use.
• Allow 10-15 minutes after plugging in probes before taking readings.
• While making measurements, never touch probe plugs or allow them to come
into contact with sources of heat or cold.
• Check DIFF ZERO periodically to ensure it has not drifted. Reset as necessary
using ZERO control.
• When making differential measurements in an electrically conductive medium, at
least one of the probes should be electrically isolated from the medium. The fol-
lowing Physitemp probes are isolated: RET-1, ESO-1, IT-14, IT-18, IT-21, IT-23,
IT-1E, TFT series. We can also supply an insulated version of our MT-23 micro-
probes if requested.
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