4 6
T O R K E L 8 2 0 / 8 4 0 / 8 6 0
P r o g r a m m a E l e c t r i c A B
Z P - B S 0 6 E R 1 0 1
17
Calibration
How to calibrate
Warning
Do not connect or disconnect any of the
cables unless the circuit breaker F1 is in
the lower (OFF) position.
Do not touch conducting parts of the
clamps on the current cables or the volt-
age sensing cables when they are con-
nected to TORKEL.
Switch on TORKEL.
In the “MAIN MENU” select “BASIC SETTINGS”.
Set “I MEASUREMENT” to “INTERNAL”.
Switch off TORKEL.
Press the <Esc> and <Stop> keys simultaneously,
while switching on TORKEL.
1. Calibrating zero levels
Message reading:
Press ENTER
to calibrate
Press <ENTER>.
Message reading:
Short-circuit
inputs
Short-circuit the inputs.
a) ”EXTERNAL CURRENT MEASUREMENT”
b) Positive (+) and negative (-) terminals for bat-
tery current.
c) ”VOLTAGE SENSE”
Message reading:
Switch on F1
Press ENTER
Set switch F1 to its upper (ON) position.
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Calibration
procedure
TORKEL has four circuits used for testing that require
calibration:
Internal current
Internal voltage
External voltage
External current
The calibration procedure has four main steps:
Calibrating zero levels
Calibrating internal current (Int I)
Calibrating internal and external voltage (V)
Calibrating external current (Ext +I)
For main steps 2, 3 and 4 you can decide whether or
not to perform them.
Note Calibrate once a year to maintain proper
accuracy.
Stable voltage and current sources (which vary
less than 1% per second) and accurate reference
instruments must be used. The current source
must be able to supply high current at a voltage
between 10 and 30 V. One or two 12 V batteries
can be used here.
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