Using A Fixed Voltage; Using A Variable Voltage - AEMC 6550 User Manual

4.4.2 Using a Fixed Voltage

Set the switch to the V-FIXED position. The following screen appears:
SET-UP
V RAMP
V VAR
V FIXED
Use the ◄ ► ▲▼ buttons to select the test voltage: 500V, 1000V, 2500V, 5000V, 10,000V or 15,000V
The instrument generates exactly the selected voltage when the measured resistance is high. When the
measured resistance is low, the output voltage decreases because of a voltage drop on a series resistance of
234kW internal to the instrument.
For example, if a test with 1000V should be performed, use the V-VAR function and adjust V so that the dis-
played voltage during measurement is 1000V (set voltage will be higher by a term Im * 234kW) - see § 2.4.3.2.

4.4.3 Using a Variable Voltage

Set the switch to the V-VAR position. The following screen appears:
SET-UP
V RAMP
V VAR
V FIXED
There are already 3 preset voltages that can be modified in SET-UP (see § 3.4). Use the ▲▼ buttons to select
one of them:
■
Adjustable Voltage 1: 50V
■
Adjustable Voltage 2: 800V
■
Adjustable Voltage 3: 7000V
Otherwise, use the ◄► buttons to go to the voltage value, then use the ▲▼ buttons to adjust the value of the
test voltage. The adjustment is in 10V steps up to 1000V, and in 100V steps above 1000V. Keeping the buttons
pressed will speed up the adjustment.
Megohmmeter Models 6550/6555
Shop for AEMC products online at:
MR
Step
Voltage
OFF
MR
Step
Voltage
OFF
ShopAEMC
www.
FIXED VOLTAGE
500 V
-- V
Input voltage
Frequency
Input current
Date 2011.05.23
ADJUSTABLE VOLTAGE
50 V
Input voltage
Frequency
Input current
Date 2011.05.24
.ca
BURN
1000 V
10 V AC
50.0 Hz
24.6 pA
Time 10:31
BURN
1
0.1 V AC
0.2 Hz
11.56 pA
Time 15:31
1.877.766.5412
.
DC
29