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{{TM500 | mfg=Tektronix | type=DC504A | function=100 MHz, 6-digit frequency counter | class=counter | image=Tek dc504a.JPG | introduced=1984 | discontinued=1993 | | |||
designers= |manuals= | |||
* [[Media:070-4291-00.pdf|DC504A Manual]] (OCR) | |||
}} | |||
It replaced the [[DC504]]. | |||
{{BeginSpecs}} | |||
{{Spec|Frequency Range | DC (AC coupled: 10 Hz) to 100 MHz (rear interface 50 MHz) }} | |||
{{Spec|Sensitivity | 30 mV<sub>RMS</sub> sine wave to 100 MHz, 85 mV<sub>p-p</sub> pulse ≥5 ns }} | |||
{{Spec|Input impedance | 1 MΩ // 25 pF (rear interface 50 Ω) }} | |||
{{Spec|Gate time | 10 ms to 10 s in decade steps (autoranging 10 ms to 1 s) }} | |||
{{Spec|Trigger Level Range | ±2 V × attenuator setting }} | |||
{{Spec|Totalize mode | 1–999999 counts up to 10 MHz }} | |||
{{Spec|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) }} | |||
{{Spec|Period resolution | ms ranges: 1 µs, 10 µs; s ranges: 10 ms, 1 ms, 0.1 ms}} | |||
{{Spec|Display Time | Variable ~0.1 s ... ~10 s and HOLD mode}} | |||
{{Spec|Time Base | 10 MHz, ±1×10<sup>-7</sup>, ±5 ppm from 0°C to +50°C, ±1×10<sup>-6</sup> per year, Adjustable to within 5×10<sup>-8</sup>}} | |||
{{EndSpecs}} | |||
==Differences to DC504== | |||
The DC504A adds a 6<sup>th</sup> display digit, extends the frequency range to 100 MHz, and single-shot resolution to 100 ns. | |||
It adds autorange and averaging, and a PLL that multiplies frequencies from 10 Hz to 25 kHz by 100. | |||
Unlike its predecessor, the DC504A has no digital outputs on the rear interface, only signal and clock inputs. There is no int/ext front panel switch (replaced by an internal jumper), and no RPM mode/jumper. | |||
==Internals== | |||
The DC504A is built around an Intersil ICM7226B counter/7-segment driver IC. The prescaler for 10−100 MHz is an MC10138 ECL counter. The ×100 PLL circuit uses a CD4046. | |||
==Rear Interface== | |||
* 16A − Signal input (GND on 17A) | |||
* 14A − External Clock (GND on 15A) | |||
==Pictures== | |||
<gallery> | |||
Tek dc504a.JPG | DC504A | |||
Tek dc504a front.jpg | DC504A | |||
DC504A_Left_Internal.jpg | DC504A left internal | |||
DC504A_Right_Internal.jpg | DC504A right internal | |||
DC504A_3-4_View.jpg | DC504A 3/4 view | |||
</gallery> | |||
[[Category:Introduced in 1984]] | [[Category:Introduced in 1984]] |