Verifying Ac Voltage - Keithley 2701 Service Manual

Model 2701 Ethernet-Based DMM / Data Acquisition System Service Manual

Verifying AC voltage

Check AC voltage accuracy by applying accurate AC voltages at specific frequencies from the AC
voltage calibrator to the 2701 inputs and verifying that the displayed readings fall within specified
ranges. An amplifier is only required for 700 V, 50 kHz output.
Do not exceed 1000 V
input. Damage to your instrument may occur.
To verify AC voltage accuracy:
1. Connect the 2701 HI and LO INPUT jacks to the AC voltage calibrator as shown in the next figure.
Be sure the INPUTS switch is in the FRONT position.
2. Select the AC volts function by pressing the ACV key.
3. Set the 2701 for the 100 mV range; make sure that REL is disabled.
4. Source 1 kHz and 50 kHz AC voltages for each of the ranges summarized in the next table and
make sure that the respective 2701 readings fall within stated limits.
ACV range Applied AC voltage 1 kHz reading limits
100 mV
1 V
10 V
100 V
750 V
*If the 5725A amplifier is not available, change the 700 V @ 50 kHz step to 220 V @ 50 kHz.
Reading limits for 220 V @ 50 kHz = 219.36 V to 220.64 V.
2701-902-01 Rev. B / December 2018
between front terminals INPUT HI and INPUT LO, or 8 × 10
PEAK
Figure 2: Connections for 2701 AC volts verification
(1 year, 18 °C to 28 °C)
100.0000 mV 99.910 mV to 100.090 mV
1.000000 V 0.99910 V to 1.00090 V
10.00000 V 9.9910 V to 10.0090 V
100.0000 V 99.910 V to 100.090 V
700.000 V 699.36 V to 700.64 V
Section 1: Performance verification
7
50 kHz reading limits
(1 year, 18 °C to 28 °C)
99.830 mV to 100.170 mV
0.99830 V to 1.00170 V
9.98300 V to 10.0170 V
99.830 V to 100.170 V
698.79 V to 701.21 V
V•Hz
1-9