User's Manual

4-10
1010NFM-3J
Section 4
If the multimeter reading does not match, use the numeric keys to type in the multimeter read-
ing.
Press to register setting. This adjusts the meter’s DAC (digital-to-analog con-
verter) so that a 2.00 Volts output corresponds with 2.00 Volts on the multimeter.
Re-check the multimeter to make sure that it is now reading 2.00 Volts.
4.5.4 PGEN OUTPUT TRIM (Pgen 1 & Pgen 2)
(Note: Can be trimmed to within 1.25 Hz of nominal.)
To calibrate a pulse rate output (Pgen1 or Pgen2):
Connect a frequency counter to the supply and return terminals of the pulse rate output under
test.
Move the highlight to the port to be tested , press , then press to move
the cursor to Trim @ 1kHz.
Press . This triggers a 1 kHz pop-up window. The frequency counter should now be
reading 1 kHz.
If the frequency counter reading does not match, use the numeric keys to type in the frequency
counter reading.
Press to register setting. This adjusts the meter’s DAC (digital-to-analog converter so
that a 1 kHz output corresponds with 1 kHz on the frequency counter.
Re-check the frequency counter to make sure that it is now reading 1 kHz.
4.6 THE RTD CALIBRATE MENU (optional)
The RTD Calibrate Menu appears on all 1010N models. Use this menu to calibrate the 991T or 1011TN
RTD Temperature Sensors to an external standard. It is important to note that the RTD temperature
sensors are factory-calibrated for high accuracy. We recommend that before deciding to perform the
calibration, check the current RTD reading in [Diagnostics/Liquid Data]. You may find that you do not
even need to calibrate the sensor. In any case, make sure that the temperature reading stabilizes
before proceeding further. The RTD Calibrate menu allows you to perform an external calibration,
which can be accomplished either by data entry of the current RTD temperature or by a 32
0
F (0
0
C) Ice-
Bath procedure. You can switch between the intrinsic and external calibration modes at any time.
NOTE: If you perform an external temperature calibration, you should mark and record the
location of each connector and sensor-cable. Once you have re-calibrated the tem-
perature sensors, changing the sensor/connector orientation established during the
procedure may void the calibration.
To access the RTD Calibrate menu press
ENT
ENT
ENT