Time Electronics 1044 DC Voltage & Current Calibrator - Manual (Page 7)

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V1.1 09/01/11 P a g e | 7 1044 Technical Manual
3.1. Preliminary
Operation of the 1044 can be defined as four different procedures; voltage source, current
source, voltage measure and current measure.
For correct operation ensure that the battery low indicator is not showing in the display. The
output will only be indicated when the polarity switch is in either ‘normal’ or ‘reverse’
positions, not in the ‘off’ position. Be certain to check the polarity settings before connecting
the unit under test. The display will show a negative sign ‘-’ if the output is in reverse polarity
mode.
The display will show the actual applied output in source mode so if the value alters when
the unit under test is connected, the loading specifications might be exceeded. This is also
useful because it eliminates potential errors when connecting to an unknown U.U.T.
Always check the mode of operation and range values before connecting to the unit under
test or to the circuit being measured. If the 1044 will not source or measure the protection
fuse has probably blown due to an excessive current being applied to the unit. This can be
found inside the 1044 - refer to section 7, page 12 for more details.
3.2. Setting a voltage output
To set a voltage output, set the function switch to V and set the appropriate voltage
range.Set to the desired voltage by turning the output adjust multiturn potentiometer, the
output voltage shown in the display will alter. The unit under test may now be connected
observing the polarity.
3.3. Setting a current output
To set a current output, set the function switch to mA and set the appropriate current range
ensuring that the output adjust potentiometer is set to zero. Connect the unit under test. The
desired current can be set by turning the output adjust multiturn potentiometer where the
output current shown in the display will alter. To obtain a current reading, a load must be
connected to the output of the 1044.
Note that if the current output is set to its maximum but is not indicated on the display, the
output load is probably too high or the battery is low. Therefore reduce the loop resistance
or replace the battery.