6

Digital multimeter specifications (continued)

Frequency specifications

Function

Input range

Frequency range:

minimum input

frequency = 1 Hz

Accuracy

±(% of reading + % of range)

Temperature

coefficient

0 ºC to 18 ºC

28 ºC to 55 ºC

1 year (23 ºC ± 5 ºC)

Frequency

Voltage:

< 2 Hz

< 20 Hz

20 Hz to 100 kHz

100 kHz to 300 kHz

0.18 + 0.003

0.04 + 0.003

0.02 + 0.003

0.02 + 0.003

0.005

0.005

0.005

0.005

Current:

10 mA to 3 A

< 2 Hz

< 20 Hz

20 Hz to 10 kHz

0.18 + 0.003

0.04 + 0.003

0.02 + 0.003

0.005

0.005

0.005

Minimum frequency sensitivity for voltage measurement (RMS sine wave)

20 Hz to 100 kHz

100 kHz to 300 kHz

300 kHz to 1 MHz

100 mV

1.0 V

10 V

100 V

750 V

50 mV

100 mV

1 V

10 V

100 V

50 mV

120 mV

1.2 V

12 V

–

0.5 V

0.5 V

–

–

–

Input range

Minimum frequency sensitivity for current measurement (RMS sine wave)

20 Hz to 100 kHz

10 mA

100 mA

1 A

3 A

1 mA

10 mA

100 mA

300 mA

1. For 100 mV and 1 V ranges, the measurable frequency is up to 1 MHz at 0.5 V input signal.

2. Maximum input for the specified accuracy = 10 x range or 1000 V

All frequency counters are susceptible to errors when measuring low-voltage, low-frequency signals. Shielding inputs from

external noise pickup is critical for minimizing measurement errors.

Duty cycle and pulse width specifications

Function

Range

Resolution

Accuracy at full scale

Duty cycle

0.001%

0.3% + 0.2% per kHz

Pulse width

0.001 ms

0.01 ms

Duty cycle/frequency

Duty cycle/frequency

1. The range is from {10 µs × frequency × 100%} ~ {[1 – (10 µs × frequency)] × 100%}. For example, a 1 kHz signal can be measured from

1% ~ 99%.

2. The positive or negative pulse width must be greater than 10 µs. The range of the pulse width is determined by the frequency of the signal.