GENERAL OPERATING INSTRUCTIONS
Instrument output voltage selection
The maximum output voltage of the instrument is 50 V. It is possible to reduce this to 25 V for operation in situations which
require it. The most appropriate output voltage should be selected by the operator based on local safety procedures.
The procedure for changing the output voltage is as follows:
DET3TA:
1.
Press and hold the TEST button and switch instrument ON to the V setting using the selector switch.
2.
The needle will sweep across the scaleplate and return to the rest position. [On older DET3TC and DET3TD
instruments, the firmware version will be displayed followed by ‘tst’].
3.
Release TEST button. The maximum output test voltage will be displayed, either ‘50 V’ or ‘25 V’.
4.
To toggle between the maximum output test voltages, press the TEST button.
5.
Switch off instrument when the desired maximum test voltage is displayed
DET3TC, DET3TD, DET4TD2, DET4TR2, DET4TC2 and DET4TCR2:
1.
Press the 25V/50V button after selecting the measurement mode; the display will indicate the selected output
voltage.
Note: For ART mode, the output voltage is automatically set to 25 V and cannot be changed.
Note: Some older versions of the DET3TC and DET3TD do not have the the 25 V/50 V button. The procedure for
changing the output voltage is as per the DET3TA
.
Auto power down
To extend battery life, the instrument will automatically switch off six minutes after the last operation.
The instrument can be switched back on by turning the selector switch to the OFF position and then selecting the desired
mode of operation.
Display symbols (DET3TC, DET3TD, DET4TD2, DET4TR2, DET4TC2 and DET4TCR2)
Symbol
Meaning
G
Warning triangle. (Refer to user guide)
f
Fuse blown.
Battery indicator.
ART
P
Situation is suitable for making ART measurements [DET3TC, DET4TC2 and DET4TCR2 only].
ART
O
Situation is not suitable for making ART measurements [DET3TC, DET4TC2 and DET4TCR2 only].
>100V
Indicates that the ground noise voltage exceeds the instrument measurement capability (test is inhibited).
Rp
P
Potential stake (P stake) is within range for accurate measurement.
Rp
O
Potential stake (P stake) resistance exceeds range for accurate measurement.
Rc
P
Current stake (C stake) is within range for accurate Measurement.
Rc
O
Current stake (C Stake) resistance exceeds range for accurate measurement.
V
P
Ground noise voltage is within range for accurate measurement of resistance.
V
O
Ground noise voltage exceeds range for accurate measurement of resistance.
P
MCC CLAMP is connected; MVC CLAMP is connected [DET3TC, DET4TC2 and DET4TCR2 only].
O
MCC CLAMP is not connected; MVC CLAMP is not connected [DET3TC, DET4TC2 and DET4TCR2 only].
