19
Megohmmeter Models 6528/6529
The other test types are selected via the
SET-UP
key:
KEY
DESCRIPTION
1
st
press
Lock the
TEST
button. In this mode, after you start the measurement, it
continues without requiring you to keep the
TEST
button pressed. The test will
run until you stop it, or when 40 minutes have passed.
2
nd
press
Activate timed test mode. You can set the test duration between 1 second and
39:59 minutes.
3
rd
press
Exit
PI
Exit timed text mode (Model 6528).
Enable the
PI
function (Model 6529). This is used to calculate the polarization
index (the ratio of the measurement at T2 [default 10 minutes] to the measurement
at T1 [default 1 minute]).
KEY
DESCRIPTION
4
th
press DAR
Enable the
DAR
function (Model 6529). This is used to calculate the dielectric
absorption ratio (the ratio of the measurement at T2 [default 1 minute] to the
measurement at T1 [default 30 seconds]).
5
th
press TEST
Exit timed test mode (Model 6529).
3.8.1 Untimed Test (Including Unlocked and Locked)
1. Turn the rotary switch to an insulation voltage setting, Choices are
250 V, 500 V, 1000 V
(available
on both the Models 6528 and 6529), and
50 V and 100 V
(available on Model 6529 only). The test
voltage to select depends on the operating voltage of the device to be tested.
2. To run an unlocked test, skip this step and continue with step 3. To lock the
TEST
button, press the
SET-UP
key once. The
icon appears on the LCD.
3. To set an Alarm (§2.12).
4. Use the leads to connect the system to be tested to the instrument’s terminals. The test sample
must be powered down and discharged. When testing insulation, the typical connection is negative
(black) lead to conductor and positive (red) lead to ground or the outer insulation of the test sample.
5. Press the
TEST
button to start the test.
If you are running an unlocked test,
hold down the
TEST
button until the displayed measurement
is stable.
If you are running a
test
, release the
TEST
button.
Note that if the instrument detects a voltage greater than 30V in the system under test, pressing the
TEST
button has no effect because the test will be prohibited.
When the insulation measurement stabilizes, it appears on the primary display (§2.5). The secondary
display (§2.5) shows the test voltage.
M
Ω
V
OFF
1000 V
500 V
M
Ω
V
k
Ω
Ω
250 V
6528 rotary switch shown
