HP 3468A - Ranging and Display Reading

Selecting the proper range on the 3468A may be done either automatically by the
multimeter, or manually with the front panel keys. The fast autoranging in the
3468A provides quick bench measurements.
| Do This
Short the 3468A’s input terminals.
press: Notice that the M RNG annunciator
turns on in the display. This indicates
that the meter is in the manual range
mode. Pressing this key again returns
the meter to the autorange mode.
press: Press each of these keys several
times. Watch the decimal point as it
[a]
OR
[~]
moves
across
the
display.
Also
notice
the range annunciator in the display.
Try this in all the measurement func-
| tion modes to see the possible range
|
displays.
The display is always read directly and gives an indication of the range as a com-
bination of decimal point and function display. Try connecting a variable dc power
supply to the multimeter. Make sure that the meter is in the DC volts function and
autorange mode. As you adjust the power supply, watch the display. The display
will momentarily go blank as the meter changes ranges. You might see a reading
such as .047215 VDC. Reading the display directly, this would indicate a
measurement of 47.215 milli-volts dc.
Table 2-4. Valid 3468A Ranges
Function Ranges Display indication HP-IL Code |
DC Volts .3V,3V,30V,300V VDC R1,R2,R3,R4
AC Volts -3V,3V,30V,300V VAC R1,R2,R3,R4
DC Current 3A ADC R1
AC Current 3A AAC R1
3A AAC R2
Resistance 3002 OHM Ri
3KQ, 30K0,300Ka KOHM R2,R3,R4
3Ma, 30MQ MOHM RS,RE
If the multimeter is in the manual range mode, the display will indicate an overload
{OVLD) when the input is greater than the particular range can handle.
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