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 {{TM500 | mfg=Tektronix | type=DC502 | function=550 MHz frequency counter | class=counter | image=Tek dc502 opt1 1.jpg | introduced=1972 | discontinued=1977 | designers= |manuals=
-* [[Media:DC502 070-1412-00.pdf|Tektronix DC502 Manual (PDF)]]
+* [[Media:DC502 070-1412-00.pdf|Tektronix DC502 Manual]]
 }}
-It measures frequencies from 10 Hz to 550 MHz or totalizes events up to the readout capacity of 10<sup>7</sup>-1 at the maximum rate of 550 MHz.
+It measures frequencies from 10 Hz to 550 MHz or totalizes events up to the readout capacity of 10<sup>7</sup>−1 at the maximum rate of 550 MHz.
-==Specifications==
-* Direct Counting to 110 MHz
-* 7 Digit LED Display
-* Manual Start/Stop (Totalize)
-* Gate times: 0.01 s, 0.1 s, 1.0 s, and 10 s
-* DIRECT INPUT:
-** Frequency range: 10 Hz to 110 MHz
-** Input impedance: 1 MΩ
-** Sensitivity: 300 mV<sub>p-p</sub> (100 mV<sub>rms</sub> sine wave)
-** adjustable trigger level range
-* &divide;10 PRESCALE INPUT:
-** Frequency range: 50 MHz to 550 MHz
-** Sensitivity: 500 mV<sub>p-p</sub> (170 mV<sub>rms</sub> sine wave)
-** Input impedance: 50 &Omega;
+{{BeginSpecs}}
+{{Spec|Resolution|7 digits}}
+{{Spec|Frequency range | 10 Hz to 110 MHz (Direct input); 50 MHz to 550 MHz (÷10 input) }}
+{{Spec|Sensitivity|300 mV<sub>p-p</sub> or 100 mV<sub>rms</sub> sine (Direct input); 500 mV<sub>p-p</sub> or 170 mV<sub>rms</sub> sine (÷10 input) }}
+{{Spec|Input impedance| 1 MΩ (Direct input); 50 Ω (÷10 input) }}
+{{Spec|Gate time| 0.01 s, 0.1 s, 1.0 s, or 10 s }}
+{{Spec|Stability|1×10<sup>−5</sup> (10 ppm) standard, 5×10<sup>−7</sup> (0.5 ppm) with Opt.01}}
+{{Spec|Features|
+* 7-digit LED Display, automatic decimal point and leading zero blanking
+* manual Start/Stop (Totalize)
+* adjustable trigger level on direct input
+}}
+{{EndSpecs}}
 The manual totalizing mode with front panel start stop control is available in both inputs; from the prescale input, 1 displayed count per 10 input events will result.
-Measurement display is accomplished with 7 segment LEDs in a seven digit readout. The decimal point is automatically positioned by the measurement interval selected, and leading zeroes (those to the left of the most sig digit or those to the left of the decimal point) are blanked.
 LEDs indicate when the gate is armed, and whether displayed numbers are in kHz or MHz, and when register overflow occurs.
-A standard internal 1 MHz clock is provided with 1 &times; 10<sup>-5</sup> (10 ppm) stability, but an "Option 01" 5 MHz clock is also available which provides 5 &times; 10<sup>-7</sup> (0.5 ppm) stability. That option includes additional circuitry to divide the clock frequency by 5 in order to obtain 1 MHz.
+The internal clock is 1 MHz. The Opt.05 high stability oscillator runs at 5 MHz with an additional by-5 divider.
 ==Links==
 * [http://www.barrytech.com/tektronix/tektm500/tekdc502.html DC502 @ barrytech.com]
+==Rear Interface==
+{| class="wikitable"
+|-
+! Connector Pin
+! Signal
+|-
+| 28B      || Second decimal point output
+|-
+| 27B      || MHz light output
+|-
+| 27A      || Internal Scan Clock Disable
+|-
+| 26A      || /RESET
+|-
+| 25B      || External Scan Clock input
+|-
+| 25A      || Time Slot Zero
+|-
+| 24B      || Internal Scan Clock output (2 kHz)
+|-
+| 23B      || Overflow
+|-
+| 22B      || MSD output
+|-
+| 21B      || BCD output 2
+|-
+| 20B      || BCD output 8
+|-
+| 20A      || BCD output 4
+|-
+| 19A      || BCD output 1
+|-
+| 19B      || Data Good
+|}
+Data is output serially by digit.
 ==Pictures==