Page 1: ...845AR...
Page 2: ...y giving full details of the difficulty and include the model number type number and serial number On receipt of this information service data or shipping instructions will be forwarded to you 2 On re...
Page 3: ...1 4 ELECTRICAL SPECIFICATIONS INPUT VOLTAGE RANGE 1 microvolt to 1000 volts dc end scale in nineteen ranges using XI and X3 progression INPUT RESISTANCE 100 megohms onllOO millivolt range and above 10...
Page 4: ...AGE TEMPERATURE RANGE 40 C to 70 C RELATIVE HUMIDITY RANGE 0 to 80 SHOCK Meets hammer blow requirements of MIL T 945A and MIL S 901B VIBRATION Meets 10 Hz to 55 Hz tests of MIL T 945A 1 6 MECHANICAL S...
Page 5: ...g the guidelines tor handling them 3 Using the procedures and packaging and bench techniques that are recommended The Static Sensitive S S devices are identified in the Fluke technical manual parts li...
Page 6: ...m can be ordered from the John Fluke Mfg Co Inc See section 5 in any Fluke technical manual for ordering instructions Use the following part numbers when ordering these special bags John Fluke Part No...
Page 7: ...ground METER Indicates the voltage applied to the input terminals OPR ZERO CONTROLS ZERO Opens input terminals and shorts amplifier input alio ing zeroing of the instrument with the lower zero control...
Page 8: ...thermal EMF s b Connect the voltage to be measured to the Model 845AR INPUT terminal and connect the common point of the voltage being measured to the COMMON terminal c Deflection of the meter indicat...
Page 9: ...lated output Range in volts 2 18 RECORDER OUTPUT 2 19 The Model 845AR ISOLATED OUTPUT may be used to provide an output voltage adjustable from zero to one volt for a full scale meter deflection for us...
Page 10: ...sponse of the instrument is unavoid ably slow due to the low pass filter used to suppress superimposed noise However the design of the low pass filter is such that common mode rejection is ex tremely...
Page 11: ...ier being precisely controlled by negative feedback The instru ment s main circuits are an input range divider a photocell modulator an ac amplifier a synchronous demodulator a dc amplifier a meter an...
Page 12: ...hes the synchronous demodulator and isolation converter drive signals and is tapped at a higher voltage level to drive the neon lamps DS101 and DS102 These neon lamps provide the drive signal for the...
Page 13: ...ch causes modulation of the dc input signal to occur The resulting modulated signal is coupled to the secondary of T203 where tran sistors Q203 and Q204 demodulate secondary signals occuring at their...
Page 14: ......
