DC504

Tektronix DC504
100 MHz, 5-digit frequency counter Tektronix DC504 Produced from 1975 to 1993 Manuals DC504 Manual (OCR) DC504A Manual (OCR) (All manuals in PDF format unless noted otherwise)

The Tektronix DC504 is a 100 MHz, 5-digit frequency counter plug-in for the TM500 system.

The DC504A successor, introduced in 1984, has 6 digits.

Key Specifications

Frequency Range	0 Hz (AC coupled: 10 Hz) to at least 80 MHz
Sensitivity (sine wave)	20 mV_RMS below 15 MHz, 35 mV_RMS to 50 MHz, derated down to 175 mV_RMS at 80 MHz
Input impedance	1 MΩ // 20 pF
Trigger Level Range	−1.5 V to +1.5 V
Maximum Frequency Resolution	kHz ranges: 0.1 Hz; 1 Hz and 10 Hz (7 digit resolution possible in overflow kHz position); MHz ranges: 100 Hz, 1 kHz (9 digit resolution possible in overflow kHz position)
Maximum period resolution	ms ranges: 1 µs, 10 µs; s ranges: 10 ms, 1 ms, 0.1 ms
Trigger Error	0.5% of one cycle at min. trigger sensitivity
Display Time	Variable ~0.1 s ... ~10 s and HOLD mode
	— Internal Standard Time Base (1 MHz) —
Stability	0°C to +50°C after 30 min warm up: 1×10^-5
Long Term Drift	1×10^-5 per month
Accuracy	Adjustable to within 1×10^-7
	— Internal Time Base Option 1 (5 MHz) —
Stability	0°C to +50°C after 30 min warm up: 1×10^-7
Long Term Drift	1×10^-7 per month
Accuracy	Adjustable to within 5×10^-9