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MODEL 1000N
NOTE: The 0.1 Ω resistor must include the value of the leads used in the calibration.
i) Adjustment of the Short Circuit Current:
• Connect an ammeter in series with the battery supply and adjust battery voltage to
9 V DC.
• Select the 1000 V / M Ω range.
• Measure RX = 1 M Ω and note the power consumption on the ammeter.
• Measure RX = 0 and adjust A1 to obtain the prior current ± 20%.
• The green LED should turn off when the battery voltage drops below 9 V.
j) Select the 1000 V / G Ω range and measure RX = 1 M Ω , 10 M Ω , then 100 M Ω . The needle
must always deflect to the left side. If not, add the diodes CR14 and CR15 to the main board.
(If not already modified).
NOTE: Let the instrument set for at least one hour before testing the specification on all the
ranges. The short circuit on step "j" disturbs the offset of the amplifier especially on the 50
V / G Ω range.
4/21/2005
REPAIR AND CALIBRATION MANUAL
13
REV. 7: March 13, 2004
FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC
CAT. #185.100
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