Verifying Ratio And Average - Keithley 2701 Service Manual

Section 1: Performance verification
2. Install the 7700 in Slot 1 of the 2701, then turn on the power and allow the unit to warm up for one
hour before proceeding. Be sure the front panel INPUTS switch is set to the REAR position.
3. Set the function generator to output a 1 kHz, 1 V RMS sine wave.
4. Select the 2701 frequency function by pressing the FREQ key. Close Channel 1 by pressing the
CLOSE key and entering 101.
5. Verify that the 2701 is between 0.9999 kHz and 1.0001 kHz.

Verifying ratio and average

Exceeding 300 V between plug-in module INPUT or SENSE H and L terminals may cause
instrument damage.
To verify ratio and average:
1. Connect the 7700 CH1 and CH11 H and L terminals to the DC voltage calibrator, as shown in the
next figure.
2. Install the 7700 in Slot 1 of the 2701, then turn on the power and allow the unit to warm up for two
hours before proceeding. Be sure the front panel INPUTS switch is set to the REAR position.
3. Select the 2701 DCV function and the 1 V range. Close Channel 1 by pressing the CLOSE key
and entering 101.
4. Select the 2701 RATIO function.
5. Set the calibrator output to 1.00000 VDC and allow the reading to settle.
6. Verify that the ratio reading is between 0.9999926 and 1.000074.
7. Press OPEN to open Channel 1.
1-28
Model 2701 Ethernet-Based DMM / Data Acquisition System Service Manual
Figure 16: Connections for Model 7700 ratio and average verification
2701-902-01 Rev. B / December 2018