Time Electronics 1007 DC Millivolt Potentiometer & Source - Manual (Page 6)

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1006/1007 Technical Manual 6
3. Operating Instructions
The 1007 incorporates a 1006 with the addition of a microvolt null detector and enables the
unit to be used for potentiometric measurements. The additional front panel components
are:
1) Null Balance Meter
2) Null Zero Adjust Control
3) Null Sensitivity Adjust Control
4) Function Switch marked SOURCE:POTENTIOMETER:ZERO
3.1. Battery Insertion
To insert batteries, remove two black covers on top of the instrument by pressing in and
turning 90° anti-clockwise. Three size AA batteries should be inserted in each tube with the
positive (tip) terminal upmost. Note that if the optional battery charger is to be used, then
nickel metal hydride (NiMH) rechargeable batteries must be used in the instrument.
3.2. 1006 Operation
Switch on supply (push button) and check the battery level. The battery level indicator is
mounted on the top (terminal end) of the unit, with a minimum line indicating when the
batteries should be replaced or recharged. Select required range with push button and dial
required output voltage. The output voltage polarity can be selected on the front panel
switch - the centre position disconnects the output and provides a short circuit on the
output terminals.
3.3. 1007 Operation
1) Millivolt Source Operation:
Operation is as the 1006 when the function selector switch is in “SOURCE” position. The
only difference being that the “OFF” position on the polarity voltage switch provides open
circuit on the output terminals - this is to prevent accidental shorting of the voltage under
test when the unit is being used as a potentiometer. It is desirable to keep the Null
“SENSITIVITY” control set to minimum (fully anti-clockwise) when the unit is being used as
a source.
2) Millivolt Potentiometric Null Operation:
Due to the extreme sensitivity of the electronic null detector (2uV/div.) it is important to
ensure that it is correctly zeroed before attempting accurate measurements.
Zero setting procedure:
a) Set function switch to ZERO.
b) Set RANGE switch to required position.
c) Sensitivity (SENS) to maximum (fully clockwise).
d) Adjust ZERO control for zero reading on null meter.
Measuring procedure:
a) Set function switch to POTENTIOMETER.
b) Set output polarity switch to NORM.
c) Set sensitivity (SENS) to minimum (fully counter clockwise).
d) Connect unknown voltage to output terminals (in the same polarity).
e) Adjust output digits and sensitivity for a null balance as required.