Page 1: ...REQUENCY COUNTER 5 of 3 ea SD oet ihe hpPe...
Page 2: ...lectable 0 1 sec 1 sec 9 digit 0 4 9mm LED with automatic decimal point Leading zero suppression Discrete LED gate status indicator 0 1 Hz on 10 MHz range with 10 second gate time 1 Hz on 100 MHz rang...
Page 3: ...TCH Applies power to the frequency counter when placed in the ON position 6 INPUT JACK 502 Signal to be measured is applied through the BNC jack with an input impedance of 502 This input is used only...
Page 4: ...of a 10 MHz signal to the counter 23 If the range Switch is in the 1GHz position 600 MHz for the 8610B the input is AC coupled to a preamplifier on the prescaler IC then to a divide by 20 combination...
Page 5: ...git 1 in the ninth position from the right through 95 Q6 and Q 7 24 regulates the input 9 volt signal from the optional line voltage converter and charges the battery pack When the power switch is in...
Page 6: ...se immunity is improved with such a system since minor fluctuations in the input waveform will not trigger a count unless the amplitude of these fluctuations exceed the hysteresis band as shown in fig...
Page 7: ...Signal which can lead to false triggering For this reason the input signal lines should be kept as short as possible 3 Harmonic distortion a If the harmonic content of the incoming signal is of suffi...
Page 8: ...AC coupled fo block DC offsets which would possibly shift the signal out of the counting range If the DC level varies duringa measurement this could shift the signal level during the time the blockin...
Page 9: ...ate position and the 100 MHz input should be used A nonmetalic screwdriver or TV alignment tool should be used to avoid pickup by Cll One method of calibrating the frequency is to use a short wave rad...
Page 10: ...e batteries and the external AC adaptor if used and a check for short circuits on the power base If the power is good and there is no gate signal on the LED the solder connections to the crystal XL 1...
Page 11: ...ds to the prescaler board for proper voltage The oscillator in Z3 is probably not functioning Check the solder connections around the crystal XL 1 This is often due to the power supply measured at poi...
Page 12: ...8000B 1 GHz PRESCALER tIV IN WE 6NO aay Ce 264 Olutd 8610B 600MHz PRESCALER Components omitted R4 R5 R6 C6 C11 Z2 Components added 56R between pins 4 10 of Z2 Link instead of Cll...
Page 13: ...S s hs Som 3 gS ON S S 3 i 3 Q ySas cade w lOutd tee Wiring Configurations Note Coax 8610B 8000B toE C A Wired CC D EE rs AA B FF OD Link BB E F C D...
