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Title

     Sprengnether PTS - "Portable Telemetry Systems"

By
O.M.
Date
16 February, 2013
Version
0.1

1 INTRODUCTION


Telemetry from Rundemanen seismometer will be converted to analogue telephone line. We will use the Sprengnether PTS equipment for amplification, modulation and demodulation of signals.

This reports details testing of Sprengnether PTS equipment.

O.M., 11 January 2008

2 STOCK OF TC-10 VCO AND TC-20 Discriminator PAIRS


VCO = Voltage Controlled Oscillator

As of 11 Jan 2008 stock is:

Center freq. [Hz]TC-10 [ea]TC-20 [ea]
68011
102011
136011
170063
204011
238011
272011

3 TC10 - VCO (VOLTAGE CONTROLLED OSCILLATOR)


Test procedure: Ref. Sprengnether manual:
Model PTS-1, PTS-3 and PTS-8. Portable Telemetry Systems. Operation and maintenance instructions.
Appendix B - ''Test procedure - VCO - TC10

3.1 Test equipment


  • Multimeter, Fluke 87-III "True RMS Multimeter", S/N: 84780210
    Calibration is due for 2008. Instead compared to Fluke 87 True RMS Multimeter, S/N: 51260916
  • Fluke 45 Dual Display Multimeter, S/N: 5160077
  • Tektronix TDS 210 Oscilloscope, S/N: B040034
  • Function generator, TC-1010A Programmable 10 MHz DDS Function Generator, S/N: 239681

3.2 Setting function generator to obtain 1.000 / -1.000 Vdc output


The following applies to TTi Mod. TG1010A "Programmable 10 MHz DDS Function Generator". We use it as a square-wave oscillator with very high duty-cycle, and very low frequency, to mimic a DC source. Watch out for the short duration pulse when the output goes low for a brief moment.

1.000 Vdc output:

  • FUNCTION = SQUARE
  • PERIOD = 5400 s (any high number)
  • V = +500 mVp-p
  • DC = 500 mV
  • SYM = 99.9%

Adjust V in mV step to obtain 1.000 Vdc output.

-1.000 Vdc output:

  • V = +500 mVp-p
  • DC = -500 mV
  • SYM = 0.1%

Adjust V in mV step to obtain -1.000 Vdc output.

3.3 Test results TC10 - VCO (Voltage Controlled Oscillator)


Switch "Volts Full Scale" set to 1.

Item Unit under test Unit under test
By O.M. O.M.
Date 20 Dec 2007 7 Jan 2008
S/N 1129 1123
fc 680 Hz 1360 Hz
Deviation +/- 125 Hz +/- 125 Hz
2.4: Adjust R20 for 0.0V at TP3 ok ok
3.1: Adjust R26 -> output frequency = fc (input shorted to GND). 680 Hz 1360 Hz
3.2: Apply 1.0008 V dc to input.
Adjust R23 until freq is 125 Hz above fc
805 Hz
[680 + 125 = 805]
1485.3 Hz
[1360 + 125 = 1485]
3.3: Apply -1.000 V dc.
Frequency should be 125 Hz below fc:
554.8 Hz
[680 - 125 = 555]
1235.5 Hz
[1360 - 125 = 1235]
3.4: "Band edge switch" in upper pos.:
Adjust R13 until freq. is 125 Hz above fc
ok 1485.1 Hz
3.5: "Band edge switch" in lower pos.:
Adjust R14 until freq. is 125 Hz below fc
ok 1235.0 Hz
4.1: Adjust R41 full CCW (counter-clock wise).
Output should be 1.5 V p-p or less, with no visible distortion:
1.6 V p-p
(just above specs -> accepted)
-
4.2: Adjust R41 full CW.
O/P should be 6.0 V p-p or more, with no visible distortion:
9.6V p-p -
4.3: Set O/P level for 2.8 V p-p ok ok
5.1a: Check again with 1.0 Vdc input, switch S1 = 1 V,
that O/P freq. is 125 Hz above center freq. of section 3.1
ok ok
5.1b: Recheck center freq. ok ok
5.2: Set I/P to 2.0 V dc.
O/P freq. should be not more than 160 Hz above center freq.:
824 Hz
[limit = 840 Hz]
1513.8 Hz
[limit = 1520 Hz]
5.3: Set I/P to -2.0 V dc.
O/P freq. should be not more than 160 Hz below center freq.:
536 Hz
[limit = 520 Hz]
1213.4 Hz
[limit = 1200 Hz]


3.3.1 5.4: Check O/P freq. for each gain I/P setting of table I. Freq. should not differ from freq. in table by more than +/- 3 Hz.

Table: Test results 5.4 for S/N 1129

Setting of S1I/P DC VoltsMeasured freq. [Hz]Target freqPass/fail
.05.05804805OK
.10.10803805OK
.20.2804805OK
.50.5804805OK
1.01.0805805OK
2.02.0804805OK
5.05.0804805OK

Higher values not tested as function generator could not give higher output voltage.

Table: Test results 5.4 for S/N 1123

Setting of S1I/P DC VoltsMeasured freq. [Hz]Target freqPass/fail
.05.0514831485OK
.10.101483.21485OK
.20.21484.91485OK
.50.51484.11485OK
1.01.01485.11485OK
2.02.01483.41485OK
5.05.01484.41485OK

Higher values not tested as function generator could not give higher output voltage.

4 AS-110 AMP (AMPLIFIER)


Test procedure: Ref. Sprengnether manual:
Model PTS-1, PTS-3 and PTS-8. Portable Telemetry Systems. Operation and maintenance instructions.
Appendix B - ''Test procedure - AS-110 AMP

4.1 Test equipment


  • Multimeter, Fluke 87-III "True RMS Multimeter", S/N: 84780210
    Calibration is due for 2008. Instead compared to Fluke 87 True RMS Multimeter, S/N: 51260916
  • Fluke 45 Dual Display Multimeter, S/N: 5160077
  • Fluke Oscilloscope, mod.: "123 Scopemeter", S/N: 9444 001 23081
  • Function generator, TC-1010A Programmable 10 MHz DDS Function Generator, S/N: 239681

4.2 Test results AS-110 AMP (Amplifier)


Item Unit under test Unit under test
By O.M. O.M.
Date 7 Jan 2008 8 Jan 2008
S/N 1259 1235
1.A.1: ok ok
1.A.2: R25 balance -> 0.0 Vdc from O/P: 0.000 Vdc 0.000 Vdc
1.A.3: Current consumption +/- 12 V supply +12 V: 0.00 A
-12 V: 0.01 A
+12 V: 0.00 A
-12 V: 0.01 A
1.B.1: ok ok
1.B.2: I/P = 10 mV p-p, square wave, 5 Hz ok ok
1.B.3: Measure signal O/P 11.9 V p-p 12 V p-p
1.B.4 120 dB -> 12 V p-p
114 dB -> 6 V p-p
108 dB -> 2.9 V p-p
102 dB -> 1.44 V p-p
96 dB -> 0.75 V p-p
90 dB -> 0.38 V p-p
84 dB -> 0.2 V p-p
78 dB -> 0.1 V p-p
72 dB -> 0.05 V p-p
66 dB -> 0.025 V p-p
120 dB -> 12 V p-p
114 dB -> 6 V p-p
108 dB -> 3.0 V p-p
102 dB -> 1.5 V p-p
96 dB -> 0.75 V p-p
90 dB -> 0.375 V p-p
84 dB -> 0.185 V p-p
78 dB -> 0.09 V p-p
72 dB -> 0.045 V p-p
66 dB -> 0.020 V p-p
1.C.1: ok ok
1.C.2: S2 = OUT (CW). Ref fig. 1.
a) Delta-V tolerance = 0.8 V +/- 0.15 V
b) Amplitude 12 V +/- 1 V
a) 0.95 V
b) 12 V
a) 0.95 V
b) 12 V
1.C.3: Ref. fig. 2 36 ms 35 ms
1.C.4: 10 Hz pos. 20 ms 20 ms
1.D.3: a) 100 Hz -> 5 ms
b) 30 Hz -> 15 ms
c) 10 Hz -> 60 ms
a) 100 Hz -> 5 ms
b) 30 Hz -> 15 ms
c) 10 Hz -> 55 ms
d) 5 Hz -> 6.0 V p-p
II.A.3.a: Pre-Amp test: Adjust R28 for 0.0 V at pin 8 set to 0.000 V set to 0.000 V
II.A.3.b: Currents: +12 V: 0.00 A
- 12 V: 0.00 A
+12 V: 0.00 A
- 12 V: 0.00 A
II.B: Gain test: I/P = Square wave, 5 Hz, 5 mV p-p
(not 2 mV p-p as function generator could not deliver lower)
O/P = 5 V p-p. Overshoot & ringing < 0.6 V O/P = 5 V p-p. Overshoot & ringing < 0.6 V

5 TC - 20 DISCRIMINATOR


Test procedure: Ref. Sprengnether manual:
Test Procedure - Telemetry Discriminator, Model TC-20

5.1 Test equipment


  • Multimeter, Fluke 87-III "True RMS Multimeter", S/N: 84780210
    Calibration is due for 2008. Instead compared to Fluke 87 True RMS Multimeter, S/N: 51260916
  • Fluke Oscilloscope, mod.: "123 Scopemeter", S/N: 9444 001 23081
  • Function generator, TC-1010A Programmable 10 MHz DDS Function Generator, S/N: 239681

5.2 Test results TC-20 - Discriminator


Item Unit under test Unit under test
By O.M. O.M.
Date 9 Jan 2008 10 Jan 2008
S/N 1229 1235
fc 1360 Hz 680 Hz
Deviation +/- 125 Hz +/- 125 Hz
Current consumption, +/- 12 V: +12 V -> 0.02 A
-12 V -> 0.02 A
+12 V -> 0.02 A
-12 V -> 0.02 A
2.3.3: R29 adjusted until 0.000 V at TP5 (O/P), with red LED lit.
No jumpers E1-E2, or E2-E3
ok ok
3.1: Set R39 full CW. With no I/P signal, LED should be ON: ok ok
3.2 & 3.3: Signal 1 V p-p to pin 21 & 22. S1 = NORM.
Monitor TP3 = Filter out (on front panel)
Input f = UPPER TUNING FREQ (Table 1)
1440 Hz - ok 760 Hz -ok
3.4: Input f = LOWER TUNING FREQ (Table 1)
Adjust R9 for max O/P at TP3.
1270 Hz - ok 590 Hz - ok
4. 1: Phase Lock Loop tuning
No jumpers E1-E2, or E2-E3 -> use test 4.1
Monitor TP3 = Filter out (on front panel)
Input f = fc, 1 V p-p
Adjust R15 so that Vout on TP5 is 0.0 V
0.000 V 0.000 V
5.1: Gain & level adjustments
Set signal to LOWER BANDEDGE
1235 Hz ok 555 Hz ok
5.2: DC-level at TP5: -1.000V - adjust with R28: 1235 Hz
O/P at TP5 adjusted to = -1.000 V
555 Hz
O/P at TP5 adjusted to = -1.000 V
5.3: Set signal to UPPER BANDEDGE 1485 Hz
O/P at TP5 = 1.012 V
805 Hz
O/P at TP5 = 1.002 V
5.4: 1465 Hz -> 0.852 V
1445 Hz -> 0.692 V
1425 Hz -> 0.531 V
1405 Hz -> 0.370 V
1385 Hz -> 0.209 V
1365 Hz -> 0.048 V
1345 Hz -> -0.112 V
1325 Hz -> -0.273 V
1305 Hz -> -0.434 V
1285 Hz -> -0.595 V
1265 Hz -> -0.756 V
1245 Hz -> -0.917 V
1235 Hz -> -0.998 V
785 Hz -> 0.841 V
765 Hz -> 0.681 V
745 Hz -> 0.520 V
725 Hz -> 0.360 V
705 Hz -> 0.200 V
685 Hz -> 0.039 V
665 Hz -> -0.120 V
645 Hz -> -0.280 V
625 Hz -> -0.440 V
605 Hz -> -0.600 V
585 Hz -> -0.760 V
565 Hz -> -0.920 V
6: Output clamp test.
No jumpers E1 - E2 - E3, which means if input below adjusted level,
output clamped to approx. 0 Vdc.
f = fc
I/P < 100 mV p-p LED is lit
f = fc
I/P < 100 mV p-p LED is lit
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