Revised: 10 November 2004
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TS-530A SPECIFICATIONS

SET POINT: Range from +500 uV to 4.2000 V. Resolution 100 uV, risetime 1 s. Can be given both manually and remotely.

INPUT SIGNAL: Analogue output from any thermometer. Input range +500 uV... 4.2000 V. Both positive and negative dV/dT is acceptable. The driving output must have a low impedance, although the average input current of the error amplifier is less than 1 uA.
      A grounded BNC connector is used for the input signal.

ERROR AMPLIFIER: The switched-capacitor amplifier has proportional gains from 5 dB to 60 dB in steps of 5 dB. Bandwidth (-3 dB) is about 10 Hz. The error signal can be shorted. This feature together with the latched position of the integrator allow the user to disconnect or switch the input while maintaining the heater output power roughly constant.

ERROR METER: A centred analogue panel meter. The meter sensitivity varies in a non-linear way, being highest in the middle and lowest at both ends of the scale. The purpose of this is to guarantee a high sensitivity for small errors near to balance while preventing the meter from saturating when the control error is large (after a change in set point).

INTEGRATOR: Analogue integrator with time constants 2, 5, 10, 20, 50, 100, 200, 500 and 1000 s. A reset position is provided for controlling in a PD mode. A latched position allows for maintaining the charge accumulated in the integrator during changes in the input signal.

DERIVATOR: The modified derivator has dominant time constants 0, 1, 2, 5, 10, 20, 50 and 100 s. The derivator has a 20 dB/dec roll-off for frequencies above 10 Hz.

BIAS POWER: A constant power term can be added to the output. Possible values are 0, 20, 40, 60, 80 and 100% of the maximum power of the selected output range. The bias power can be useful when controlling in the P or PD modes, without the integrator. After a well guessed output power bias, a smaller correcting P term is required, and the control error will also be smaller.

POWER AMPLIFIER: The output type is a linear current source. Maximum output power is (0.1 A)2 * RH or (9 V)2/RH, whichever is less.
     Nominal power ranges from 1 uW to 1 W are obtained when the heater resistance is 100 ohms. Any other heater value can be used, but the maximum power, and also the deflection of the output power meter, will be smaller.
     A square-root approximation has been used to make the output power a linear function of the error signal. Therefore, the gain of the controller remains constant regardless of the power level.

HEATER OUTPUT: A grounded BNC connector. The output is short-circuit proof.

POWER METER: Analogue panel meter indicates either true dissipated power, or percentage of the maximum current of the selected output range. If the heater is much less than 100 ohms, the current display may give more information, as it maintains the full deflection. If RH is more than 100 ohms, it is the output compliance voltage that limits the power.

REMOTE CONTROL: The TS-530A can be remotely controlled indirectly, via the computer interface of an AVS-47B AC Resistance Bridge. Following items can be programmed (written):

  • Set point (digital data)
  • Error grounded / normal
  • Proportional gain
  • Integrator time constant including reset and latched positions
  • Derivator time constant
  • Bias power
  • Heater power range
Following items can be measured using the A/D converter of the AVS-47B:
  • Set point analogue voltage
  • Heater output current (approximate)
  • Heater output power (approximate)
MAINS INPUT: 95-120V or 190-240V 12VA. The power input is filtered.

DIMENSIONS: 88 mm (H) x 483 mm (W) x 305mm (D). Weight 5 kg.

ORDERING INFORMATION:
TS-530A-115 for 95-120VAC operation
TS-530A-230 for 190-240VAC operation


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