Valhalla Scientific 4314KV, Руководство по эксплуатации

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11
Displays
Ohms Display and Multiplier LEDs
Under normal operations, the Ohms display will indicate the value of the resistance being measured. The
3 LEDs next to the display window, will indicate whether the value displayed is in Ohms, kOhms or MOhms.
(ohms, kilo-ohms or mega-ohms).
On KVS models, the ohms display will read FSt during Fail-Safe test mode.
Interpreting the Display
All Valhalla ohmmeters and igniter testers use a high impedance voltmeter as part of the resistance
measurement process. This voltmeter is a highly accurate and stable 24 bit analog-to-digital converter
(ADC). Unless it is receiving a definite input signal, the output reading of this ADC is ambiguous. The display
may indicate a randomly wandering number or it may indicate an over-range condition. This unpredictable
display may make it seem to appear that the instrument is experiencing some sort of malfunction. It is, in
fact, just a characteristic of the voltmeter circuit and should not be mistaken for a fault in the instrument.
The display indications should be ignored unless there is a definite measurement being taken. If this
wandering display is not acceptable, the ohmmeter can be made to indicate zero whenever the sense
terminals are shorted.
The display should indicate a stable reading when the test leads are securely attached to the device under
test. If the display appears to be erroneous when connected to a load, recheck the test leads for integrity
and cleanliness. If all external items appear to be functioning properly, the problem may be the
ohmmeter. In this case, please contact your local Valhalla Scientific Sales Office.
Current Display and Multiplier LEDs (KVS models only)
Under normal operations, the Current display will indicate the value of the source current being used by
the tester. The 3 LEDs next to the display window, will indicate whether the value displayed is in mAmps,
µAmps or nAmps. (milli-Amps, micro-Amps or nano-Amps). The display will indicate the measured value
of the current on ranges 2Ω to 20kΩ and the nominal value of the current.
The display indications should
be ignored unless there is a definite measurement being taken.
When a Fail-Safe test is initiated by the user by pressing the Fail-Safe Test button, the Current display will
indicate the true (measured) Fail-Safe value for the range selected.
During Fail-Safe test mode, the Current display will indicate the value of the fail-safe current being
measured.