WPI DAM50 Instruction Manual Download Page 9

DAM50

World Precision Instruments 

5

AC or DC Recording?

It should be noted that DC recording with metal electrodes will invariably result in 

excessively large galvanic potentials being applied to the amplifier’s input terminals. 

This can result in overdriving the amplifier so that the POSITION control will not be 

able to restore the operating baseline’s position. In this case, use Calomel or Ag-AgCl 

electrodes, or use an external variable bucking potential; alternatively, resort to AC 

recording.

MAINTENANCE

Testing the Amplifier

Instrument POWER is provided by two alkaline 9 volt batteries. Battery operation 

results in lower internal noise level. Batteries can be tested by activating the BAT/CAL 

switch. If a short tone is heard, the batteries are functional. Conversely if the tone is 

absent, the batteries must be replaced. An additional function that the BAT/CAL switch 

performs is to provide a low frequency square wave test signal which is applied to the 

amplifier input. The amplitude of this signal is 100 microvolts when operating in either 

of the two highest GAIN positions and 1 millivolt in the lowest GAIN position.  

Mode

Gain

Cal signal

Output 

DC

10×

1 mV

10 mV  

DC

100×

1 mV

100 mV 

DC

1000×

100 µV

100 mV

AC

100×

1 mV

100 mV 

AC

1000×

1 mV

1000 mV 

AC

10,000×

100 µV

1000 mV

Summary of Contents for DAM50

Page 1: ...Instrumenting scienti c ideas WORLD PRECISION INSTRUMENTS DAM50 Differential Amplifier Serial No _____________________ www wpiinc com INSTRUCTION MANUAL 092618...

Page 2: ......

Page 3: ...ode A B 7 b Single ended configuration Mode A 7 B 5489 mini banana adaptor for glass 8 a Differential configuration Mode A B 8 b Single ended configuration Mode A 8 C 5447 2 mm adaptor for glass 9 a D...

Page 4: ...ii World Precision Instruments...

Page 5: ...N Cautions warn against actions that can cause damage to equipment Please read these carefully This symbol indicates a WARNING Warnings alert you to actions that can cause personal injury or pose a ph...

Page 6: ...electrodes Unpacking Upon receipt of this instrument make a thorough inspection of the contents and check for possible damage Missing cartons or obvious damage to cartons should be noted on the deliv...

Page 7: ...case Amplification is controlled by the GAIN selector switch Note that amplification is ten times larger in the AC mode than in the DC mode Electrode Impedance If electrodes of very high impedance are...

Page 8: ...4 World Precision Instruments Fig 1 GAINS This chart shows the standard 3dB frequency cutoff at maximum filter band pass...

Page 9: ...ent POWER is provided by two alkaline 9 volt batteries Battery operation results in lower internal noise level Batteries can be tested by activating the BAT CAL switch If a short tone is heard the bat...

Page 10: ...e 470 Ohms Battery Test 1 second audible tone Calibrator Signal 10 Hz square wave amplitude 100 V at 1000 and 10 000 1 mV at 100 and 10 DC Power 2 9V alkaline batteries supplied Input Cables 1 shielde...

Page 11: ...Instruments 7 M3301EH M3301R TM31A10 DAM50 RC1T 300647 M3301EH TM31A10 DAM50 MD4R 5052 M10 RC1T 300647 b Single ended configuration Mode A A 300647 Prewired cable for metal electrodes a Differential c...

Page 12: ...uments B 5489 mini banana adaptor for glass a Differential configuration Mode A B b Single ended configuration Mode A DAM50 DAM50 EP2 EP2 13620 13388 2505 2505 2505 5444 5444 5489 5489 3294 3294 MEH7W...

Page 13: ...recision Instruments 9 C 5447 2 mm adaptor for glass a Differential configuration Mode A B DAM50 13620 2505 5444 MEH7W10 MEH7W10 13620 RC1T 5447 b Single ended configuration Mode A DAM50 5447 5444 250...

Page 14: ...10 World Precision Instruments DECLARATION OF CONFORMITY...

Page 15: ...special or consequential arising from a failure of this product to operate in the manner desired by the user WPI shall not be liable for any damage to data or property that may be caused directly or i...

Page 16: ...ny Saarstra e 23 D 61169 Friedberg Hesson Germany Tel 49 0 6031 1602171 Fax 49 0 6031 1602180 E mail wpide wpi europe com China Hong Kong WPI Shanghai Trading Co Ltd Rm 25e No8 Dongfang Rd Pudong Dist...

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