ACU-RITE D200 DRO

ACU-RITE 2x Mill D200

Overview

Glass scale based digital read out (DRO). It uses a vacuum fluorescent display (VFD) rather than a more modern LED displays.

2X MILL D200  DOM
PN: 2001003
SN: 99050879 Rev: B

Photos

https://www.ebay.com/itm/122087858728

Taken from eBay seller lovedabeach's eBay Item #122087858728.

Replacement Parts

Transformer

ENSIGN CORPORATION
2001-900 B
172.9911

172 is the manufacturer code (Acu-Rite or Ensign?) 9911 is the date code, November 1999. B is the revision level.

Specs:

Input Power: 115/230VAC ± 20% @ 50/60Hz
Output #1: 7V minimum ripple valley @ 1.4ADC / 47000uF (± 20%) capacitor with 80% nominal input (92VAC instead of 115VAC), 15V ripple peak @ 450mA with 120% (138VAC instead of 115VAC) input.
Output #2: 34V minimum @ 115mA DC / 1000uF (± 20%) capacitor with 80% nominal input, no maximum specified.
typical forward diode drop is expected to be 1V
thermal fuse on each secondary, if it blows it's permanent.
external fusing, 0.5A slow blow for 115V operation, 0.25A slow blow for 230V operation.

Transformer pinout:

The bobbin manufacturer and Acu-Rite use different pin mappings. On the bobbin, pin #1 is marked by a notch in the plastic, that pin is also closer to it's adjacent pin than the rest. The bobbin pin numbers are numbered 1-6 then 7-12 clockwise (TODO: from above or below?). In other words, bobbin pins 6 and 7 are across from each other at the same end of the transformer.

Bobbin Pin	Acu-Rite Pin	Function
1	[NC]	[NC]
2	1	Primary #1 A
3	2	Primary #1 B
4	3	Primary #2 A
5	4	Primary #2 B
6	[NC]	[NC]
7	5	>34V out
8	6	>34V out
9	[NC]	[NC]
10	[NC]	[NC]
11	7	7-15V out
12	8	7-15V out

For 115V operation, jumper Primary #1A to Primary #2A as well as Primary #1B to Primary #2B. This puts the primaries in parallel.
For 230V operation, jumper Primary #1B to Primary #2A. This puts the primaries in series.