Section 2: Performance verification
Model DMM6500 6½-Digit Multimeter with Scanning Calibration and Adjustment Manual
2-40
DMM6500-905-01 Rev. A/July 2018
Verify the DMM6500 zero:
1. On the calibrator, select the
OPR/STBY
key. Make sure that the front panel displays
STANDBY
.
2. Verify the DMM6500 zero reading for each range.
Apply a relative offset to the system:
1. On the calibrator, select the
OPR/STBY
key. Make sure that the front panel displays
OPERATE
.
2. Enable the calibrator Amplifier and select the
BOOST
key.
3. On the calibrator, set the amplifier range lock to
ON
.
4. Set the calibrator output to
0.00000 ADC
and allow the reading to settle.
5. Press the
MENU
key.
6. Select
Calculations
.
7. Select
Rel
and
Acquire
.
8. Source positive and negative full-scale and half-scale currents, as listed in the following table.
9. Verify that the STATISTICS swipe screen reading for average is within low and high limits.
Verify digitize current 10 A range
Description
Calibrator setpoint
(A)
Lower limit
Upper limit
UUT Zero
STANDBY
-8.00E-03 REL
8.00E-03 REL
Full scale (+)
10
9.00
1.01
Half scale (+)
5
4.00
5.00
Half scale (
–)
–5
–5.00
–4.00
Full scale (
–)
–10
–1.01
–9.00
AC current 10 A verification
Verify that the displayed readings are within specified limits.
Use the values in the tables following the steps below to verify the performance of the DMM6500.
Actual values depend on the published specifications (see
Example reading limit calculation
To verify the AC current accuracy:
1. Set the TERMINALS switch to
REAR
.
2. Press the
FUNCTION
key, select the
Measure Functions
tab, and select
AC Current
.
3. Press the
HOME
key.
4. Set the range to
10A
.
5. Press the
MENU
key.
6. Under Measure, select
Settings
.
7. Make sure that detector bandwidth is set to
30 Hz
.
AC current is specified for the detector bandwidth setting of 3 Hz. 3 Hz measures accurately for input
signals from 3 Hz to 10 kHz, with reading rates of ≈ 0.5 readings/s. To improve verification
throughput to ≈ 3.3 readings/s, set detector bandwidth to 30 Hz for frequencies of 30 Hz to 10 kHz.
To verify frequencies 1 kHz and
higher, set the detector bandwidth to 300 Hz for faster ≈ 55
readings/s throughput.