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Summary of Contents for Sinclair DM350
- Page 1 DM350 and DM450 DIGITAL MULTIMETERS INSTRUCTION MANUAL...
- Page 2 INDEX INTRODUCTION Power The Sinclair DM350 and DM450 are laboratory quality, digital multimeters differing only their and resolution (scale accuracy Function and Range Selection length). Overrange Indication Both instruments are housed battery-operated in a robust, Input Terminal Polarity making them suitable for portable...
- Page 3 96> v—‘F—WCCE (—4 DDEDUD DUDE W?®@P...
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Page 4: Operation
Function and Range Selection The Function and Range are selected the push-buttons Overrangelndication (5) and (6)-- DM350: When reading of 1999 exceeded, overrange dicated by blanking of volts: ranges are available covering most significant digit voltages up to... - Page 5 HP11, 935, 814, 2009 Resistance: out the leads will range, shorting which should produce non zero reading, 1400, E93, AL-1, VS1335 Alkaline Types: subtracted from measurement reading. Rechargeable Batteries Special Sinclair units are available. instructions rechargeable Full for use are provided pack.
- Page 6 Overload and Protection Safety Precautions with exception of the 2000 ranges The DM350 and DM450 have been range on the highest designed volts and 20A range on AC and current, can be used up to standards safety but safe operation depends...
- Page 7 Interference Avoiding Ground Loop Measurements Waveform Making Complex connected, ground loop currents can adaptor/charger The Sinclair DM350 and DM450 are calibrated to display than source ground different potential half-wave rectified value signal wave whose average sine value of attenuated ground. This effect...
- Page 8 the Resistance Using Ranges the exception With the 200 the resistance ranges range, power', they generate voltage across the ‘high resistor at scale —20mV full resistor reading. is in place semiconductor junction, across this junction could forward bias above cause 10% of range.
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Page 9: Specification
(19°C—24°C) SPECIFICATION VOLTAGE scale reading full Max. DM450 Permissable DM350 Input Resolution Resolution Range Accuracy Accuracy Overload Impedance i0.1%fs 200mV 0.05%ri0.02%fs 10ml 0.1%r 1UOILI/ 4OOVpk 2000mV 0.05%rf0.01%fs 10.05%fs >1000M 0.1 %r 400Vpk 100ILV 0.05%ri~0.01%fs 0.1%r :l;0.05%fs 100uV 400Vpk :0.01%fs 0.1%r 0.25%ri-_0.05%fs... - Page 10 AC~ CURRENT 50/60Hz meaxée rasponse within Freq1u1e;cy addltlonal error Burden i0.2%fs 0.3%r 0.35%ri0.2%fs 211A 20Hz 10kHz — 0.3%r i0.15%fs 200A 10nA 0.35%r:j:0.15%fs 10nA 20Hz 10kHz — ;t0.15%fs 0.3%r 100nA 0.35%rj 200pLA 0.15%fs 100nA 200mV 20Hz 10kHz —- 0.3%r 0.15%fs 0.35%r:,0.15%fs 200mV 20Hz 10kHz...
- Page 11 Power: maintenance work, this should only be con- cells Sinclair their own Four disposable Manual which may be purchased junction with Service Battery Pack or approved Rechargeable directly from Sinclair Radionics or their agents overseas. adaptor...
- Page 12 (OM-450} @RVI @003. 'RVZ...
- Page 13 Defective instruments should be returned, carriage paid, to Multimeter Service Sinclair Department, Radionics Limited. Careful packing essential retain original packing material. — the guarantee has expired or...
- Page 14 The fuseholder has an adaptor accept 20mm x 5mm This adaptor should fuses. be discarded when fitting 1%" fuses. 1/1" Refer instruction manual for fuse type and rating. INSTRUCTION SHEET 48581-0140...
- Page 15 Stott Printed by Brothers Limited, London and Halifax, England...