T
HE
MENU S
YSTEM
PM100 / 300 U
SER
M
ANUAL
P
AGE
12 VPN 98-052
Voltage Scaling and Current Scaling
For use with voltage transformers / dividers and current transformers.
Connect to the V HI and LO terminals for voltage probes, and to the A HI and
LO terminals for current probes.
Current Scaling = 100mV/A
I = 10 Amp
100mV/A
EXT
0.1
A
+
+
-
-
V = 1V
LO
Note: When using 1000:1 CT as in the above example, enter ‘1000’ as the
current scaling.
Manual Ranging. (PM100 Only)
By default, the analyzers are fully auto-ranging. This is the ideal setting for
most applications since the analyzers will then always be operating on the
optimum range. No settings are required by the user in this case.
In measurement applications where there are transients or bursts of signals, then
data may be lost due to the time taken by the analyzer to perform the automatic
range selection. In this case, the auto-ranging may be switched off and a manual
range selected.
The PM100 has 8 current and 8 voltage ranges as described below.
To set a manual range, simply select ‘
9
’ for Manual V Range or Manual A
Range in M[2] and then enter the approximate maximum peak current or
voltage that is expected. (This can be measured by pressing the PEAK key). It is
not necessary to remember the exact ranges of the PM100, since they will be
selected for you according to the following tables.
Amps Peak
Range
Amps Peak
Entered
Volts Peak
Range
Volts Peak
Entered
0.1 0.0 ≤ 0.1
7.5V 0.0 ≤ 7.5
0.3A 0.1 ≤ 0.3
15V 7.5 ≤ 15
0.9A 0.3 ≤ 0.9
30V 15 ≤ 30
2.7A 0.9 ≤ 2.7
60 30 ≤ 60
8.1A 2.7 ≤ 8.1
120V 60 ≤ 120
24.3A 8.1 ≤ 24.3
240V 120 ≤ 240
72.9A 24.3 ≤ 72.9
480V 240 ≤ 480
200A > 200
1000V > 480
When a manual range is set, the analyzer will make accurate measurements for
signals up to the specified range peak.
Notes.
1) Small signals may not be displayed because of the analyzer’s display
blanking feature and this should be disabled. See M[2] ‘Disable Blanking’.
2) Scaling is ignored. When setting a manual range, use the actual peak
current or voltage seen at the terminals of the PM100.
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