Agilent Technologies DC140 Uživatelský manuál stáhnout pdf (Strana 11)

Digital multimeter specifications (continued)

Supplemental characteristics (continued)

Diode

Measurement method 0.83 mA ± 0.2% constant current source

Open circuit voltage < +5.0 V

Audible tone

• Continuous beep when level is below +50 mV DC

• Single tone for normal forward-biased diode or semiconductor junction where

0.3 V ≤ reading ≤ 0.8 V

Input protection 1000 V

rms

on all ranges, < 0.3 A short circuit

Capacitance

Measurement method Computed from constant current source charge time, typical 0.2 to 1.4 V signal level

Maximum voltage at full scale

• For 1 nF to 10 µF range: < 1.5 V

• For 100 µF to 10000 µF: < 0.33 V

Input protection 1000 V

rms

on all ranges, < 0.3 A short circuit

Response time Approximately 1 s for 100 µF and ranges below 100 µF

Charge and discharge voltage 5 V

(approximately from +3 V to –2 V)

Frequency

Measurement method Reciprocal counting technique

Signal level 10% of range to full scale input on all ranges

Input protection

• Voltage path: 750 V

rms

on all ranges

• Current path: Protected with 3.15 A/500 V, FF fuse

Maximum display counts (excluding frequency)

5½ digits 120,000

4½ digits 12,000

Measurement noise rejection

CMRR (Common Mode Rejection Ratio)

for 1 kΩ unbalanced in LO lead

• DC: 140 dB

• AC: 70 dB

NMRR (Normal Mode Rejection Ratio)

60 Hz ± 0.1%

• 5½ digit: 65 dB

• 4½ digit: 0 dB

50 Hz ± 0.1%

• 5½ digit: 55 dB

• 4½ digit: 0 dB

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