HTC DM 91 Operator's Manual - Page 3

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Screw
⑩
2.2 FUNCTION AND RANGE SELECTOR
This meter is a portable professional measuring instrument with large LCD display and back light for easy reading.
This meter has the function of preventing the test leads from wrong connecting. The input socket for red test lead is arranged with
proper functions and ranges, when the transform switch can't be rotated, stop rotating. It means the selected range isn't suitable with
position of the red lead socket. Pull out the read lead and then select the range required, this provides protection for meter to avoid
damage by operating improperly.
This meter has function of Data-hold.
A rotary switch is used to select functions as well as ranges.
3. SPECIFICATIONS
Accuracy is specified for a period of year after calibration and at 18℃ to 28℃ (64℉ to 82℉) with relative humidity to 75%.

3.1 GENERAL SPECIFICATIONS

3.1.1 It includes 30 ranges of function.
3.1.2 Over-range protection for all ranges.
3.1.3 Operating altitude: 2000 meters (7000ft.) maximum.
3.1.4 Max Voltage between Terminals and Earth Ground: 1000V DC or AC (peak value).
3.1.5 Fuse protection: F1-200mMA/250V F2-10A/250V
3.1.6 Display: 28mm LCD, word is 28mm high
3.1.7 Max Show Value: 1999 (31/2)
3.1.8 Polarity Indication: "-" indicates negative polarity.
3.1.9 Over-range Indication: display "1" or "-1".
3.1.10 Sampling Time: approx. 0.4 second.
3.1.11 Power Supply: 9V battery, 6F22 or NEDA 1604.
3.1.12 Low Battery Indication: '
3.1.13 Temperature Factor: <0.1x Accuracy/℃
3.1.14 Operating Temperature: 0℃ to 40℃(32℉ to 104℉)
3.1.15 Storage Temperature:-10℃ to 50℃(10℉ to 122℉)
3.1.16 Dimension: 191x82x36MM (without holster)
3.1.17 Weight: approx. 280g (including battery)

3.2 ELECTRICAL SPECIFICATIONS

Circumstance Temp.: 23±5℃
3.2.1 DC Voltage
Range
Resolution
200mV
2V
20V
200V
100mV
1000V
-- Input Impedance: 10MΩ
-- Overload protection: 200mV range: 250V DC or rms AC
2V-1000V ranges: 1000V DC 0r 700V rms AC
NOTES:
At the little voltage range, the meter will show unsteady reading when the test leads haven't reach the circuit, it's normal because the meter is
very sensitivity. When the test leads touch the circuit, you can get the true reading.
3.2.2 AC Voltage
Range
Resolution
2V
20V
200V
100mV
700V
-- Input Impedance: 10MΩ
-- Overload protection: 200mV range: 250V DC or rms AC
2V-700V ranges: 1000V DC 0r 700V rms AC
-- Frequency Range: 40 to 400Hz
-- Test on 60Hz/50Hz
LCD Display
①
Power Switch
②
Backlight set switch
③
Data-hold Switch (H)
④
Rotary Switch
⑤
Input Jack
⑥
Case
⑦
Battery Door
⑧
Brace
⑨
' displayed
Relative Humidity: <70%
0.1mV
±(0.5% of rdg + 1 digit )
1mV
10mV
±(0.5% of rdg + 3 digits)
1V
±(0.8% of rdg + 3 digits)
1mV
10mV
±(1.0% of rdg + 5 digits)
1V
±(1.2% of rdg + 5 digits)
Accuracy
Accuracy
3