Flagship DL01: Pulse Voltage Table

Tx Gain Setting	DL-200V	DL-300V	DL-500V
0	42	64	103
1	57	85	141
2	71	107	180
3	88	131	224
4	123	182	320
5	147	218	387
6	219	323	585
7	270	408	(!)

Important details follow – please click read more to see the full post here.

• Be careful with “Tx Gain” settings and note that what the transducer (XD) sees might be different – see also: https://oshablue.com/doc/flagship-dl01-pulse-voltage/.
• Gain settings above 4 require using the override command in standard firmware and may not function in continuous acquisition (until FW update).
• Voltages are maybe +/- 5VDC or more, depending on circumstances. These are nominal values.
• The voltage that is actually pulsed onto the cable or sent to the XD depends on other board factors, like the output transistors that are installed – and those can vary with supply chain issues and substitutions, even if they are close.
• For example the 200V board assembly, due to supply chain issues, most likely (depending on assembly choices as it turns out) also has output transistors that are adequate generally but for the same voltage have a slightly reduced output.
• GXN500 is configured such that its output is around -323VDC.
• HDL-0108-RSCPT (“RS8”) rapid scan USB board, -200V stock build range almost linearly from about -107V@TxG6 to -200V@TxG26. Below TxG6 output is mostly off, and if TxG was previously higher, there is decay over a few seconds. Above TxG26 the output on the HIVDC module basically tops out at the -200V.

Peak-to-Peak Pulse Voltages

Typical Vpp for the example condition as noted here.

• Cable lengths:
• Board Nom HIVDC: DL-300
• Measurement at a Tee at the Ch 1 coax connector, 3-ft RG-316 cable to XD, 2-ft RG-316 cable to scope, note effects of measurement apparatus
• Damping JP set as in QA Tier 1 Standard as of/thru 2025 (JP West 2 pins shunted) and Rs installed as standard BOM – see also “Damping” article, see also example values in “Pulse Voltage Table”
• C049 composite mimics QA Tier 1 Standard as of/thru 2025
• Format is Vpp (Vp-Vn) scaled | #Neg Half-Cycles + #Pos Half-Cycles above 10% of Peak | Duration of these cycles [ns] | {Vn, Vp unscaled}

Tx Gain Setting	Britek-C049	BSI-B02	Vpp for Term R [51Ω]
0	83.2 | 1+0 | 420 | {-40,1.6}		62 | 1+0 | 192 tot/160 sq | {-30.4/146ns sq (init neg overshoot+10Vfull cycle/24ns),1.2}
1	101.2 | 1+0 | 420 | {-49,1.6}		See Note 4
2	113.2 | 1+0 | 420 | {-55,1.6}		See Note 4
3	142.8 | 1+0 | 440 | {-69,2.4}
4	194.8 | 1+0 | 420 | {-95,2.4}
5 (with override)	N/A
6 (with override)	N/A
7 (with override)	N/A
	See Note 1 below		See Note 3 below

Notes

1. C049
   • Note in return WF (not shown or described here) single negative, dual positive primary pulse in every echo within first window, aka quite sharp relatively speaking, relative to de facto norm in recent eras
   • Resonance(s) here exceed
2. Values are with measurement circuitry in place
3. Term R Test (as expected):
   • Adapters right at Tee (no cable, several adapters) for BNC to test R
   • Vmin (abs max) as expected, to tank voltage
   • Term R example 50, 68, etc increasing, nominally matched, and increasing to open circuit, similar in this measurement configuration
   • Term R example [6.8Ω] Approaching short hence:
     • 1+1 | 230 | {-39Vo/s,50.4 reflection} where 1-pos is <1/2 duration of 1-neg square (altered resonance)
     • Similar to XDs (etc) with inductances (see other articles) that have similar previously characterized effects (by intent)
4. If user removes damping JP West position, then default PAC settings TXG1 Vpp value become just shy of TXG2 row value in this table.